Answer:
Hi LizBiz! The answer is Ctrl key on Windows, or Command key for Mac.
Explanation:
The Ctrl (Windows) key or equivalent Command key on Mac has a special purpose which allows special operations to be performed when combined with another action, such as clicking on multiple pictures or files for selection.
Answer:
d. public myClass( ) {. . .}
Explanation:
A constructor is a special method that is called when an object of a class is created. It is also used to initialize the instance variables of the given class. A class may have one or more constructors provided that these constructors have different signatures. A class that does not have a constructor explicitly defined has a default parameterless constructor.
Having said these about a constructor, a few other things are worth to be noted by a constructor.
i. In Java, a constructor has the same name as the name of its class.
For example, in the given class <em>myClass</em>, the constructor(s) should also have the name <em>myClass</em>.
ii. A constructor does not have a return value. It is therefore wrong to write a constructor like this:
<em>public void myClass(){...}</em>
This makes option a incorrect.
iii. When a constructor with parameters is defined, the default parameterless constructor is overridden. This might break the code if some other parts of the program depend on this constructor. So it is advisable to always explicitly write the default parameterless constructor.
This makes option d a correct option.
Other options b and c may also be correct but there is no additional information in the question to help establish or justify that.
Answer:
public static void init(int[] arr, int n) {
if (n==0)
arr[0] = 0;
else {
arr[n-1] = n - 1;
init(arr, n-1);
}
}
Explanation:
Create a method called init that takes two parameters, an array and the number of elements in the array
When n reaches 0, set the first element to 0 (This is a base for our recursive method)
Otherwise, set the element in index i to i
Call the init inside the init, this is the recursion part, with same array but decrease the number of elements by 1 (We decrease the number of element by 1 in each time so that it goes through all the elements in the array)
